JPS6110950A - Stator of magnet rotary machine - Google Patents

Abstract

PURPOSE:To improve the impact resistance by applying an equal distributed load from the inner periphery to a pole holding plate made of an elastic steel strip, and securing the pole with clamping force. CONSTITUTION:The entire inner surface of an elastic steel strip 6 inserted into the inner periphery of a pole is uniformly pressed to contact the strip 6 with a permanent magnet 4 and an auxiliary pole 3, the strip 6 is butted in the state that extensions 7 are formed between the poles, and the poles are secured circumferentially by a clamping force. The strip 6 is plastically deformed by the pressure from the inner periphery in the axial direction, and the chamfered part of the permanent magnet 4 and the end of the pole 3 are secured.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention (1) relates to a stator of a stone rotating machine, in particular, an elastic steel strip is inserted into the inner periphery of the magnetic pole, and the inner periphery of the permanent magnet, the chamfered part, and the auxiliary pole are This invention relates to a stator structure with excellent impact resistance, in which steel strips are butted and fixed in close contact with the inner periphery, with overhangs provided between the magnetic poles.

[Background of the invention]

Conventionally, there are many known examples of magnetic pole holding structures for identifiers. For example, in JP-A-57-122659, an aluminum cylindrical cover is inserted into the inner circumference of a permanent magnet, and an elastic body at the tip of an upper punch is used to hold a cylindrical pole. The permanent magnet is fixed by pressing the cover outward to form an overhang between the magnetic poles. However, in the case of aluminum material, after the pressure is removed, there is no tension force on the L-shaped member, so a small gap is generated between it and the permanent magnet due to springback. Furthermore, in order to prevent gaps from forming due to the difference in coefficient of thermal expansion between Dermi and the permanent magnet, it was necessary to use an adhesive in combination.

Another example is disclosed in JP-A-54-118510, in which a steel strip is inserted into the inner periphery of the magnetic poles, an overhang is provided in the gap between the magnetic poles, and the steel strips are butted against each other to fix a permanent magnet. In this example, the magnet is fixed in the axial direction by using an annular aluminum plate and crimping, which has the disadvantage of increasing the number of parts.

[Purpose of the invention]

An object of the present invention is to provide a stator for a magnetic rotating machine that has strong impact resistance.

[Summary of the invention]

By uniformly applying pressure to the entire inner surface of the elastic steel strip inserted into the inner periphery of the magnetic pole, the steel strip is brought into close contact with the permanent magnet and auxiliary pole, and the ends are brought into tension by butting together with an overhang between the magnetic poles. The magnetic poles are fixed by force, and the chamfered part of the permanent magnet,
The steel strip is also deformed in the end space of the auxiliary pole, making it possible to fix it in the circumferential direction and the axial direction.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

■ is a stator with multiple thicknesses Hl and inner diameter D+ on the inner circumference of yoke 2.
auxiliary electrode 3 and H2 which is slightly thicker than H1 juxtaposed thereto.
The permanent magnets 4 having an inner diameter D2 are combined to form one magnetic pole. Reference numeral 5 denotes a supporting metal plate made of an elastic steel plate that is placed between the magnetic poles and tensions and fixes the magnetic pole in the circumferential direction. 6 is a magnetic pole holding plate made of an elastic steel strip, which is inserted into the inner circumference of the magnetic pole with tension, and is inserted into the inner circumference of the magnetic pole with tension. Fixing is being done. The reason for choosing Hl < H2 here is to obtain high inner diameter dimensional accuracy by applying the steel strip to a permanent magnet having a large inner peripheral area.

In such a configuration, the entire length of the holding plate 6 is made longer than the circumferential length determined from the inner diameter D2 of the permanent magnet by ΔS, and after being inserted into the inner periphery of the magnetic pole, uniform pressure is applied to the entire inner periphery so that the steel strip The steel strips 6 were brought into close contact with the permanent magnet 4 and the auxiliary pole 3, and the steel strips 6 were butted against each other with an overhang 7 provided in the space between the magnetic poles, and the magnetic poles were fixed in the circumferential direction by tension force. Also, in the axial direction, the steel strip 6 is
is plastically deformed and fixed to the chamfered portion 41 of the permanent magnet 4 and the end portion 31 of the auxiliary pole 3, and this point differs from conventional known examples.

That is, in the present invention, by uniformly applying pressure to the entire inner circumferential surface of the retaining plate 6 made of an elastic steel strip, a uniformly distributed load is applied to the overhanging portion 7 between the magnetic poles, and W: total load;
t: Length of the deflection section, E: Modulus of longitudinal elasticity, I: Moment of inertia of area Here, when the middle part of the magnetic pole is pressurized with a concentrated load for t3 as in the conventional example, the maximum deflection is σ"" 48EI,
Compared to this, a large load can be applied, so the magnetic pole can be fixed with a large tension force, and at the same time, the steel strip can be plastically deformed at the axial chamfer or the end of the auxiliary pole 3.

There are various methods for applying uniform pressure to the inner circumference, such as water pressure, hydraulic pressure, pressure using explosive force, and pressurization by inserting rubber.

〔Effect of the invention〕

According to the present invention, in a stator of a magnet rotating machine, an evenly distributed load is applied from the inner periphery to the magnetic pole retaining plate made of an elastic band, and the magnetic pole is fixed with a tension force, which is the conventional method of applying a concentrated load. It is possible to apply 1.6 times the load under the same conditions compared to , which increases the tension and fixing force accordingly. Furthermore, since the magnetic poles can be fixed by plastic deformation in the axial direction at the same time, the number of parts is small, and gaps do not occur due to temperature changes.
A stator with excellent fixing force can be obtained without using an adhesive.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of main parts of the stator of the present invention, and Fig. 2 is a front view of the stator of the present invention.
3 is a cross-sectional view taken along line A-A in FIG. 1, which is a component layout diagram before obtaining the finished product shown in the figure. 1... Stator, 2... Vertical iron, 3... Auxiliary pole, 4...
... Permanent magnet, 5... Supporting metal fitting, 6... Holding plate, 4
1... Permanent magnet chamfered portion, 7... Overhanging portion.

Claims (1)

[Claims] 1. A magnetic pole in which a plurality of permanent magnets and auxiliary poles are arranged side by side on the inner periphery of a cylindrical yoke, and fixed in an annular shape by pressing the yoke from the inner periphery with an elastic steel band. Slightly longer than the inner circumference of the magnetic pole,
An elastic steel strip with a width approximately equal to the total length of the permanent magnet is rolled into a cylindrical shape and inserted, and uniform pressure is applied to the entire surface of the elastic steel strip from the inside to bring the steel strip into close contact with the permanent magnet. A stator for a magnet rotating machine, characterized in that the steel strip is in contact with the poles and extends into the gap between the magnetic poles, and the steel strips are abutted against each other at a permanent magnet part, and the magnetic poles are fixed to the yoke by tension force. 2. A patent characterized in that a uniformly distributed load is applied to the steel strip between the magnetic poles to form an overhanging portion, and the length of the steel strip is determined to be longer than the inner circumference of the magnetic poles so that the stress in this portion is below a permissible value. A stator for a magnet rotating machine according to claim 1. 3. A stator for a magnet rotating machine according to claim 1, characterized in that the magnetic poles are fixed by extending steel strips from the axial ends of the auxiliary poles and from the chamfered portions of the permanent magnets.